diff --git a/.changeset/bat120-battlechain-mainnet.md b/.changeset/bat120-battlechain-mainnet.md
new file mode 100644
index 0000000000..ccd12e9754
--- /dev/null
+++ b/.changeset/bat120-battlechain-mainnet.md
@@ -0,0 +1,5 @@
+---
+"viem": patch
+---
+
+Added BattleChain Mainnet (chainId 626) to `viem/chains`.
diff --git a/src/chains/definitions/battlechain.ts b/src/chains/definitions/battlechain.ts
new file mode 100644
index 0000000000..088e144e57
--- /dev/null
+++ b/src/chains/definitions/battlechain.ts
@@ -0,0 +1,28 @@
+import { defineChain } from '../../utils/chain/defineChain.js'
+import { chainConfig } from '../../zksync/chainConfig.js'
+
+export const battlechain = /*#__PURE__*/ defineChain({
+  ...chainConfig,
+  id: 626,
+  name: 'BattleChain Mainnet',
+  network: 'battlechain',
+  nativeCurrency: { name: 'Ether', symbol: 'ETH', decimals: 18 },
+  rpcUrls: {
+    default: {
+      http: ['https://mainnet.battlechain.com'],
+    },
+  },
+  blockExplorers: {
+    default: {
+      name: 'BattleChain Explorer',
+      url: 'https://explorer.battlechain.com',
+      apiUrl: 'https://block-explorer-api.battlechain.com/api',
+    },
+  },
+  contracts: {
+    multicall3: {
+      address: '0xcA11bde05977b3631167028862bE2a173976CA11',
+      blockCreated: 40,
+    },
+  },
+})
diff --git a/src/chains/index.ts b/src/chains/index.ts
index df9dea4658..1ef540e98a 100644
--- a/src/chains/index.ts
+++ b/src/chains/index.ts
@@ -63,6 +63,7 @@ export { base, basePreconf } from './definitions/base.js'
 export { basecampTestnet } from './definitions/basecampTestnet.js'
 export { baseGoerli } from './definitions/baseGoerli.js'
 export { baseSepolia, baseSepoliaPreconf } from './definitions/baseSepolia.js'
+export { battlechain } from './definitions/battlechain.js'
 export { battlechainTestnet } from './definitions/battlechainTestnet.js'
 export { beam } from './definitions/beam.js'
 export { beamTestnet } from './definitions/beamTestnet.js'